/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
/**
 * @filename: function/math/int_val.cc
 */
#include <server_includes.h>
#include CSTDINT_H
#include <function/math/int_val.h>

void Item_func_int_val::fix_num_length_and_dec()
{
  max_length= args[0]->max_length - (args[0]->decimals ?
                                     args[0]->decimals + 1 :
                                     0) + 2;
  uint32_t tmp= float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals= 0;
}

void Item_func_int_val::find_num_type()
{
  switch(hybrid_type= args[0]->result_type())
  {
    case STRING_RESULT:
    case REAL_RESULT:
      hybrid_type= REAL_RESULT;
      max_length= float_length(decimals);
      break;
    case INT_RESULT:
    case DECIMAL_RESULT:
    /*
      -2 because in most high position can't be used any digit for int64_t
      and one position for increasing value during operation
    */
    if ((args[0]->max_length - args[0]->decimals) >=
        (DECIMAL_LONGLONG_DIGITS - 2))
    {
      hybrid_type= DECIMAL_RESULT;
    }
    else
    {
      unsigned_flag= args[0]->unsigned_flag;
      hybrid_type= INT_RESULT;
    }
    break;
    default:
    assert(0);
  }
  return;
}

